Found this from the Shelton Herald;

Permits to use the city of Shelton’s Sunnyside boat ramp are available for purchase and are valid for the calendar year (Jan. 1–Dec. 31). The launch is off Route 110 and provides access to the Housatonic River for boaters.
The permits can be bought in the town clerk’s office at Shelton City Hall.
Also, state-issued marine sportsman licenses are available for purchase in the town clerk’s office.